This business goes way beyond Brexit. A large and complex web gradually emerges from the morning mist: so though we may have Leave.EU (UKIP, Farage, Banks) and Vote Leave (Johnson, Gove, Stephen Parkinson - adviser to May), BeLeave (Vote Leave's 'yoof' wing), Veterans for Britain and the DUP, we also have Cambridge Analytica (preliminary campaign work for Leave.EU) and Aggregate IQ (data and advertising for Vote Leave, Veterans for Britain and DUP). But there's also SCL (Cambridge Analytica, Alexander Nix), Steve Bannon (ran Trump's campaign, formerly on the Cambridge Analytica board, Breitbart), Facebook, Trump's election, private psy-ops and who knows who or what else. Intriguing, and more a spreading vine than a few sour grapes.
https://www.theguardian.com/uk-news/2018/mar/24/aggregateiq-data-firm-link-raises-leave-group-questions